_logb

Visual Studio 2005

Extracts an exponential value of a double-precision floating-point argument.

```
double _logb(
double x
);
```

Parameters

x

Double-precision floating-point value.

Return Value

_logb returns the unbiased exponential value of x.

Remarks

The _logb function extracts the exponential value of its double-precision floating-point argument x, as though x were represented with infinite range. If the argument x is denormalized, it is treated as if it were normalized.

Input SEH exception Matherr exception

± QNAN,IND

None

_DOMAIN

± 0

ZERODIVIDE

_SING

Requirements

_logb

<float.h>

ANSI, Windows 95, Windows 98, Windows 98 Second Edition, Windows Millennium Edition, Windows Millennium Edition, Windows NT 4.0, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003

For more compatibility information, see Compatibility in the Introduction.

Libraries

All versions of the C run-time libraries.

.NET Framework Equivalent

Not applicable. To call the standard C function, use PInvoke. For more information, see Platform Invoke Examples.